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3 years ago

5x^{2} -60 = 20 Solve by using the quadratic formula PLZ help

Mathematics

1 answer:

almond37 [142]3 years ago

3 0

Answer: x=4,-4 Solve the equation for x by finding a, b, and c of the quadratic then applying the quadratic formula

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Help please!!!

katovenus [111]

Answer:

x = $\frac{7+\sqrt{47}\times i }{4}$

Step-by-step explanation:

<u>To solve quadratic systems,we always substitute one variable in terms if the other and then solve the equation.</u>

x + 2y = 6 ---------------(1)

y - 5 = $(x-2)^{2}$ ---------------(2)

y = $(x-2)^{2}$ + 5 ---------------(3)

Substitute (3) in (1) ,

x + 2( $(x-2)^{2}$ + 5 ) = 6

$(a + b)^{2}$ = $a^{2} + 2ab + b^{2}$

x + 2( $x^{2} - 4x + 4$ + 5 ) = 6

$2x^{2} - 7x + 12=0$ --------------(4)

The roots of the quadratic equation $ax^{2} +bx+c$ is

x = $\frac{(-b) + \sqrt{(-b)^{2}-4 \times ac } }{2 \times a}$ -----------(5)

According to equation (5),solution of (4) is

x = $\frac{7 + \sqrt{(-7)^{2}-4 \times 24 } }{2 \times 2}$

x = $\frac{7+\sqrt{49-96}}{4}$

x = $\frac{7+\sqrt{47}\times i }{4}$

4 0

3 years ago

Convert 1200 second to hours (with calculation)

IRISSAK [1]

1200 seconds divided by 3600=

0.33333333 of an hour or a third of an hour.

Or just 20 minutes lol

3 0

3 years ago

Orlando bought a new couch for 1,968 , using the furniture store's finance plan. He will pay 164 a month for 12 months. Which eq

Savatey [412]

We will owes 0 dollars cause 164 multiply by 12 = 1968

8 0

3 years ago

NEED URGENT HELP

AnnyKZ [126]

Answer:

32.5

Step-by-step explanation:

If CED is 65, then AEB is 65, therefore we can calculate that CEA is 115 because 180 - 65 = 115. Then we do 180 - 115 = 65 which is the sum of angles ACE and CAE so 65 / 2 = 32.5 which is CAE.

Hope this helped!

8 0

3 years ago

Using L'Hopital's rule, evaluate the limit as x approaches infinity of (sin (8x))/(5x)

sweet-ann [11.9K]

Answer:

45.89

Step-by-step explanation:

This is what is the answer

6 0

3 years ago